Question

if LCM of 18 and 81 is 162 then find the HCF is is​

Answer 1

BY PRIME FACTORISATION

18 = 2 × 3 × 3

81 = 3 × 3 × 3 × 3

HENCE, HCF IS "9"

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Answer 2

Answer:

The prime factorisaion of 18 is 2×3×3

The prime factorisaion of 81 is 3×3×3×3

So here 3×3 is common in both of these.

So the HCF is 18 and 81 is 3×3

=9

HCF=9

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